Dianella tasmanica Tasred ('Tr20'PBR)

RHS Plant Profile
Tasman flax lily [Tasred]

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Synonyms

Dianella tasmanica 'Tr20'PBR

Herbaceous Perennial
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An evergreen perennial to around 50cm high, forming clumps of wide, strappy, stiff green leaves with rough edges, that take on a reddish-pink tint at the base in cooler temperatures. In summer, produces sprays of star-shaped blue-purple flowers on delicate stems, followed by deep blue berries

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Loam Sand
Moisture
Well–drained
pH
Acid or Neutral

Position

Full sun Partial shade
Aspect
South–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H3
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asphodelaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Clump forming
Potentially harmful
Fruit are ornamental - not to be eaten. Wear gloves and other protective equipment when handling
Genus
Dianella are rhizomatous evergreen perennials with leathery, sword-shaped leaves and sprays of small, starry deep blue flowers followed by long-lasting blue or purple berries
Name Status
Trade

How to Grow

Cultivation

In milder areas, grow outdoors in moderately fertile, well-drained, neutral to acid soil in full sun or partial shade. In areas prone to hard frosts, grow under glass in peat-free, loam-based compost, in full light with shade from hot sun. Water well in growth and keep just moist in winter.

Propagation

Propagate by division in spring. As this plant is protected by Plant Breeders' Rights, any propagation should be for personal rather than commercial use

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Gravel garden
  • Patio and container plants
  • Low Maintenance
  • Conservatory and greenhouse

Pruning

Trim old leaves as necessary

Pests

Generally pest-free

Diseases

Generally disease-free